System Sensor BS5839

Note: This document is based on the recommendatio ns of BS5839 Part 1: 2002. I t is intended only as a guide to the ap plication of ﬁre detection systems.

Reference must be made to relevant national and local stan dards.

2251EIS INTRINSICALLY SAFE DETEC TOR AND IST200

INTERFACE

The 2251EIS analogue addressable photoel ectric sensor is a

plug in Intrinsically Safe smoke sensor combi ning an optical

sensing chamber with analogue addressab le communications.

As an Intrinsically Safe sensor, the 2251EIS has b een designed

speciﬁcally to provide ﬁre protect ion for most hazardous

environments, and has therefore be en engineered so that it

cannot become a source of ignition in areas w here potentially

explosive atmospheres are likely to arise.

The IST200 translator module s erves as an interface bet ween

the control panel and up to a maximum of 15 x 2251EIS smoke

sensors. The IST200 must be u sed in conjunction with a

Y72221 custom galvanic isolato r barrier.

Tested and approved to EN54-7 and by BASEEFA ( 2001) to

EEx ia IIB T5 for use in Zone 0 hazardou s areas.

Speciﬁcations

Note that there are limitations of capac itance, inductance and

inductance/resistan ce ratio connected within the ha zardous

area. Reference must therefore be m ade to product data

before installation of these devices .

Voltage: 17 to 24VDC

Max. standby current: 330µA

(One communication every 5s

with LED blink enabled)

Max. alarm current: 4.2mA at 24VDC

Weight: 102g

IST200

Input Voltage: 15 to 32VDC

Output Voltage: 20 to 24VDC

Supply Current: 14mA at 24VDC

Dimensions: 70mm x 70mm x 32mm (h x w x d)

Weight: 142g

System Sensor Intelligent Product Range